JVM command-line parameters such as this are generally set in the hadoop-env.sh file.
dbr On 12/2/2010 1:11 AM, Philip Zeyliger wrote: > HADOOP_NAMENODE_OPTS="-Xmx500m" will set it to 500MB. The "OPTS" here > refers to JVM options. -Xmx is a common JVM option to set the maximum > heap. > > -- Philip > > On Wed, Dec 1, 2010 at 4:27 AM, Dave Shine > <dave.sh...@channelintelligence.com> wrote: >> I'm using 0.20.2. >> >> I've seen references to HADOOP_NAMENODE_OPTS, but nothing that clearly >> explains how to set them. >> >> Any help would be greatly appreciated. >> >> Dave Shine >> >> -----Original Message----- >> From: Hemanth Yamijala [mailto:yhema...@gmail.com] >> Sent: Tuesday, November 30, 2010 9:39 PM >> To: common-dev@hadoop.apache.org >> Subject: Re: Configuring Heap Size for Name Node >> >> Hi, >> >> On Wed, Dec 1, 2010 at 1:38 AM, Dave Shine >> <dave.sh...@channelintelligence.com> wrote: >>> How do I change the heap size for the Name Node (and Secondary Name Node) >>> without changing the heap size for the data nodes, job tracker, and task >>> trackers? >> Which version are you using. I am pretty certain that 0.21 and above >> have HADOOP_NAMENODE_OPTS which can be used to set the heap size only >> for NameNode. You can check if this option is defined in >> hadoop-env.sh. >> >> Thanks >> Hemanth >>> Thanks, >>> Dave Shine >>> Sr. Software Engineer >>> >>> 1180 Celebration Blvd Suite 101 >>> Celebration FL 34747 >>> Office 321-939-5093 >>> Mobile 407-314-0122 >>> Fax 321-939-5604 >>> dave.sh...@channelintellence.com<mailto:dave.sh...@channelintellence.com> >>> http://www.channelintelligence.com<http://www.channelintelligence.com/> >>> >>> >>> >>> ________________________________ >>> The information contained in this email message is considered confidential >>> and proprietary to the sender and is intended solely for review and use by >>> the named recipient. Any unauthorized review, use or distribution is >>> strictly prohibited. If you have received this message in error, please >>> advise the sender by reply email and delete the message. >>>
